WMS with POST Requests to Avoid Long URLs

sld, sld_body, post, iframe, advanced

Render tiles in IMG or IFRAME elements, depending on
the complexity of the GetMap request

The maxGetUrlLength property of the layer's
tileOptions option causes tiles to be requested using
HTTP POST when the length of the GET url would exceed the specified
length (2048 characters is recommended). In real life applications,
this happens often when using the SLD_BODY request parameter for
inline styling.